Memory Limits

I am sure this topic is beaten to death for any open source product like RM and Weka, but can I get a definitive answer for Rapid Miner?

Ran out of memory on a few runs with RM lately.

On a windows 32 bit operating system (XP), what is the max memory that can be used by RM?

On a windows 64 bit operating system (Windows 7), what is the max memory that can be used by RM?

Thanks!